Malicious PDF — malware analysis report

Static analysis result for SHA-256 08df4d0d536e51a2…

MALICIOUS

PDF

78.5 KB Created: 2021-10-10 04:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e382cadd1b2b0cc729f9fd65d2630d81 SHA-1: 904c7a52fb351bb47c9953aae658f4d2d24a5bfc SHA-256: 08df4d0d536e51a29590dd45ab3c8bc5ad244ec03361282872dbb77bcc3e3561
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to a large number of potentially malicious or phishing sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=male+with+down+syndrome+chromosomes PDF link annotation
    • http://anhbanglaw.com/userfiles/file/21552769386.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5bfc2644d---pozekesi.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/jilezilataluzukawat.pdfIn PDF document text
    • http://wwstationery.com/files/file/jipuvumoposajipu.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/14760913591.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/56291156523.pdfIn PDF document text
    • http://preiss.at/upload_files/files/besegox.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/zinesarodewat.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/pitagorurojebavijejujo.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/43497468760.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158d347907c4---lisesikupiraxozag.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/53310155749.pdfIn PDF document text
    • https://swiz.eu/files/editor/jufesupixot.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/72456255803.pdfIn PDF document text
    • https://sledovani3.gpshlidac.cz/www/userfiles/files/48361777948.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/xenemavofanitosakonamifex.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zufenixoki.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/newob.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/33118815543.pdfIn PDF document text
    • http://feg.vn/uploads/files/24242711692.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/48195021632.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/62280400133.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/nuxebepisogusizugeza.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/4245516715.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 10828 bytes
SHA-256: 168cabcb92d2c501c8c6922bed011380a34c0e78692fcd3d2ae328490e8c7c8f
font_01_sfnt_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 17412 bytes
SHA-256: 9539567798b92dce7685f73191e5ba7be7ed1a018525401444ef86b7ee51ae76

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